The instructions at: https://ttlc.intuit.com/community/saving/help/how-do-i-save-my-turbotax-online-return-as-a-tax-data-... do not work - That is TurboTax US so it wouldn't work for Canada.
Unfortunately, in TurboTax Canada you will not be able to merge the TurboTax Online to the TurboTax CD/Download version as they are two separate platforms. You will have to start over your return.
Thank you for choosing TurboTax.